economists say americans are worried about higher payroll taxes and the outlook for jobs. but despite that, the dow rose 72 points, the nasdaq fell a fraction, the s&p added seven points. after the market close, investors also shrugged off a disappointing earnings report from amazon and bought up the stock. amazon shares surged as much as 9%. it earned 21 cents a share, six cents below analyst estimates. revenues rose 22% but were a billion less than estimates. amazon's c.e.o., jeff bezos, said the company's e-book business is paying off, growing by about 70% last year and is now a "multibillion-dollar category." but he didn't say how many kindle fire tablets amazon has sold. still, jason moser, an analyst with the motley fool, says: >> really, i think that amazon is going to prove to be the leader here in retail-- not just online retail-- because i think retail in general is heading towards online retail for the most part, and amazon is really what is really setting the standard there. and that's why i think you see amazon performing so well today, and companies like walm